Clamp



(NoModeL) P. GORBETT8 CLAMP.

Patented Jan. '17, 1888.

i i 1 mm. a. W my lJNiTE STATEs Fries.

PHILIP F. CORBETT, OF BOSTON, MASSACHUSETTS.

CLAMP.

SPECIFICATION forming part of Letters Patent No. 376,637, dated January17, 1888.

Application filed April 16, 1887. Serial No. 235.004. (No model.)

To all whom it may concern.-

Be it known that I, PHILIP F. CORBETT, of Boston, in the county ofSuffolk, State of Massachusetts, have invented a certain new and usefulImprovement in Clamps, of which the following is a descriptionsufficientl y full, clear, and exact to enable any person skilled in theart or science to which said invention appertains to make and use thesame, reference being had to the accompanying drawings, forming part ofthis specification, in which- Figure 1 is a side elevation of myimproved clamp; Fig. 2, a top plan View of the same; Fig. 3, an enlargedside elevation of the tailstock detached; Fig. 4, a top plan view of thesame; Fig. 5, a vertical transverse section taken on line a: min Fig. 3;and Fig. 6, a vertical longitudinal central section through a portion ofthe tail-stocks and body, showing the construction of the teeth or dogson the tailstocks and the sockets therefor in the body.

Like letters of referenceindicate corresponding parts in the differentfigures of the drawlugs.

My present invention relates to thatclass of clamps which are employedby carpenters, cabinet-makers, and other wood-workers for gluing uptheir work, and is designed as an improvement on the clamp secured to meby Letters Patent of the United States No.292, 207-, dated January 22,A. D. 1884; and it consists in a novel construction and arrangement ofparts, as hereinafter fully set forth and claimed, the object being toovercome certain minor defects in said patented clamp and produce a moreeffective device of this character than is now in ordinary use.

The nature and operation of the improvement will be readily understoodby all conversant with such matters from the following explanation.

In the drawings, A represents the body of the plamp, B the head-stock,and C the tailstoc z.

The body is provided with a metallic capplate, D, which is securedthereto by screws f, and beneath the projecting edges of said plate, ateither side thereof, the body is me beted to form the grooves H, as bestseen in Fig. 5.

The tail-stock C is preferably composed ofmetal, and is provided at itsrear or outer end with a downwardly-projecting flange, k, at either sideof the body A. A pin or stud, t, is rigidly secured in each of theflanges 7c, said pins respectively projecting into the grooves t in thebody A, in which they are fitted to slide, and keeping the rear or outerend of the tail-stock in proper position when the clamp is in use.

Centrally pivoted at m to either side of the tail-stock C, near itsinner or forward end, there is a downwardlyprojecting vertical1yarrangedlever, E, provided on its inner face, near the lower end, with a hook orcatch, 0', adapted to enter the groovet beneath the plate D, as bestshown in Fig. 5. A coiled spring, y, is disposed around each of thepivots at, one end of which rests against the upper end of the lever E,as shown atg, and the other against the body of the tail-stock, as shownat b, said spring acting expansively to force the upper ends of saidlevers outward and to keep the catches r in the grooves t or inengagement with the edges of the plate D. A series of centrally-arrangedbackwardly-inclined sockets, d, are formed in the plate D and top of thebody A; and, projecting downward from the under side ofthe tail -stockC, nearits inner or forward end, there is a backwardly-inclined hook ordog, o, adapted to enter said sockets and anchor or secure the tailstockwhen the clamp is in use.

As the head-stock B is constructed in substantially the same manner asthe'tail-stook, excepting as hereinafter specified, it is not deemedessential to describe it fully.

Ahorizontally-arrangedscrew,H,is mounted centrally on the head-stock B,said screw being fitted to work in correspondingly-threaded holes (notshown) in the inwardly-projecting portions or flanges Land provided atits inner or forward end with a guard, 10, and at its rear or outer endwith a handle, 2.

A hook or dog, 1), projects downwardly from the under side of thehead-stock B near its inner or forward end, said hook being adapted toentera socket, d, formed in the plate D and body A, as shown in Fig. 1,'and anchor or secure the head-stock in substantially the same mannerthat the hook o anchors or secures the tail-stock, it being understoodthat the hook on the head-stock and also the socketin which it entersare respectively inclined in a direction opposite the hook on thetail-stock and sockets for receiving said last-named hook.

A slide, J, is mounted on the plate D between the head and tail stocks,said slide being provided with-an angular flange ateither side near thebottom, which projects into the groove 1 and keeps the slide in positionon the plate. The slide is also titted with avertically-arrangedset-screw,j, provided at its lower or inner end with a guard, 20, whichpresses on the plate I.) when the screw is turned in, and therebyanchors the slide or prevents it from slipping when in use.

In the use ot'said patented clamp, when the head and tail stocks are inposition and the body is turned upside down, as is frequently necessaryin gluing up cabinet and similar light work, the hooks at the inner endsot'said stocks are liable to fall out of their sockets unless the workis tirmly clamped and there is a strain on the screw, thereby frequentlycausing injury to the work and rendering it necessary to reverse theposition of the body and adjust the stocks before the clamp can be used.It also sometimes occurs that the body of the clamp has to be turnedupside down to insert the work; andin such instances, there being nostrain on the screw, the hooks at the inner ends of the stocks areliable to drop from theirsockets, thus necessitating readjusting theclamps and causing a loss of time and labor. My present invention isdesigned to obviate this objection; and to that end I make use ot'thespring-actuated levers E, provided with hooks or catches 1', whereby theinner or forward ends of the stocks are prevented from falling away fromthe plate I) and withdrawing their hooks r fromtheirrcspective sockets(i when the body A is turned upside down.

In the use 01" the clamp, when it is desired to withdraw the hook ofeither stock from its socket, the upp r ends of the levers l] are pushedinward. thereby disengaging the catches r and projecting edges of theplate l), and permitting the hook to be readily withdrawn from itssocket, in a manner which will i spectivcly arranged on opposite sidesof said be readily obvious without a more explicit description.

The guard 20 on the setscrewj is considerably greater in diameter thanthe lower end of said screw, which is titted to turn therein, but not tobe withdrawn therefrom; and by presenting a large bearing-surface saidguard prevents the slide J from slipping as readily on the plate 1),when the screw is turned in to secure it in any desired position, aswould otherwise be the case.

In the use of my improved clamp the work is placed between thetail-stock U and slide .7, after which the screw i is turned in againsttially as shown and described.

said slide, forcing it against the work, the screw j being turned in ordown to secure the slide in position when sut'ticient pressure has beenexerted on the work by the screw H, alter which the headstock may beremoved, 6 if desired, leaving the work clamped between the taitstockand slide, thus enabling the samehead-stock to be used with severalbodies.

The stocks are respectively rounded on the under side at their rear oroutcreuds, asshown by dotted lines at 42, to enable the stocks to bereadily tilted or. thrown back in detaching the hooks from the sockets.

I do not contine myself to the use of two of the levers E with eachstock, as one may be employed, although I deem two much preferable.Neither do I confine myself to using the slide J, as this may beomitted, if desired, and the work clamped directly between the stocks;nor to the use of the plate 1), as this may be omitted and the sockets(Z and grooves ti'ormed directly in the body A; nor to constructing thebody A. stocks B O, screw II, or slide J of any special materials, asany suitable materials maybe used; nor to the use of the studs 2', asthese may be omitted, it desired, although their use is preferable.

Having thus explained my invention, what I claim is 1. In a clamp ot thecharacter described, the tail stock (I, provided with the dog or hookand pivoted spring-actuated lever E, having the catch 1', in combinationwith the body A, provided with the socketd and groove 1, substantially rdescribed. 3

2. In a clamp ot' the character described, the tail-stock C, providedwith the hook r, studs 1 and pivoted spring-actuated lever '15, havingthe catch 1', in combination with the body A, provided with the socket dand groove 100 t, substantia ly as set t'orth.

:3. in a clamp ot' the character described, the tail'stock (1, providedwith the hook o, and pivoted levers it], having catches r, incombination with the body A, provided with the 105 socket 2: and groovest I, said levers being rcstock, and provided with springs adapted tot'orce their catches into said grooves, substan- I IO 4. In a clamp ofthe character described, the head-stock li, provided with the hook v,studs t, and spring-actuated levers 1 having the catches i, incombination with the screw it and body A, provided with the socket (1 H5and grooves! substantially as set forth.

ll i llil t F. ()Ol'tllE'tT. \fi l n csses:

O. 3'. ttnxw, it]. L. St W nn.

